TY - JOUR
T1 - Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition
AU - Ao, Hong
AU - Dupont-Nivet, Guillaume
AU - Rohling, Eelco J.
AU - Zhang, Peng
AU - Ladant, Jean Baptiste
AU - Roberts, Andrew P.
AU - Licht, Alexis
AU - Liu, Qingsong
AU - Liu, Zhonghui
AU - Dekkers, Mark J.
AU - Coxall, Helen K.
AU - Jin, Zhangdong
AU - Huang, Chunju
AU - Xiao, Guoqiao
AU - Poulsen, Christopher J.
AU - Barbolini, Natasha
AU - Meijer, Niels
AU - Sun, Qiang
AU - Qiang, Xiaoke
AU - Yao, Jiao
AU - An, Zhisheng
N1 - Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - The first major build-up of Antarctic glaciation occurred in two consecutive stages across the Eocene–Oligocene transition (EOT): the EOT-1 cooling event at ~34.1–33.9 Ma and the Oi-1 glaciation event at ~33.8–33.6 Ma. Detailed orbital-scale terrestrial environmental responses to these events remain poorly known. Here we present magnetic and geochemical climate records from the northeastern Tibetan Plateau margin that are dated precisely from ~35.5 to 31 Ma by combined magneto- and astro-chronology. These records suggest a hydroclimate transition at ~33.7 Ma from eccentricity dominated cycles to oscillations paced by a combination of eccentricity, obliquity, and precession, and confirm that major Asian aridification and cooling occurred at Oi-1. We conclude that this terrestrial orbital response transition coincided with a similar transition in the marine benthic δ18O record for global ice volume and deep-sea temperature variations. The dramatic reorganization of the Asian climate system coincident with Oi-1 was, thus, a response to coeval atmospheric CO2 decline and continental-scale Antarctic glaciation.
AB - The first major build-up of Antarctic glaciation occurred in two consecutive stages across the Eocene–Oligocene transition (EOT): the EOT-1 cooling event at ~34.1–33.9 Ma and the Oi-1 glaciation event at ~33.8–33.6 Ma. Detailed orbital-scale terrestrial environmental responses to these events remain poorly known. Here we present magnetic and geochemical climate records from the northeastern Tibetan Plateau margin that are dated precisely from ~35.5 to 31 Ma by combined magneto- and astro-chronology. These records suggest a hydroclimate transition at ~33.7 Ma from eccentricity dominated cycles to oscillations paced by a combination of eccentricity, obliquity, and precession, and confirm that major Asian aridification and cooling occurred at Oi-1. We conclude that this terrestrial orbital response transition coincided with a similar transition in the marine benthic δ18O record for global ice volume and deep-sea temperature variations. The dramatic reorganization of the Asian climate system coincident with Oi-1 was, thus, a response to coeval atmospheric CO2 decline and continental-scale Antarctic glaciation.
UR - http://www.scopus.com/inward/record.url?scp=85092667044&partnerID=8YFLogxK
U2 - 10.1038/s41467-020-18824-8
DO - 10.1038/s41467-020-18824-8
M3 - Article
SN - 2041-1723
VL - 11
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 5249
ER -